JP3880377B2 - Mounting structure of liquid crystal display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure and a mounting method for a liquid crystal display element in a liquid crystal projector, and in particular, eliminates the occurrence of change with time after alignment adjustment, and enables high-precision adjustment accompanying downsizing and high definition of the liquid crystal display element size. The present invention aims to realize a mounting structure and method for a liquid crystal display element in a liquid crystal projector.
[0002]
[Prior art]
Conventionally, an image synthesized with optical means for separating the light source into red, blue and green light, a liquid crystal display element and driving means for modulating each light, and a synthesizing means for synthesizing the red, blue and green modulated by the above. In a liquid crystal projector having a projection lens that projects the above, a liquid crystal display element has been performed by a complicated mechanical mechanism when alignment adjustment or the like is performed on the color light combining means. On the other hand, with the recent trend toward smaller and higher-definition liquid crystal display elements, high-accuracy fixing methods are becoming mainstream. Adhesive methods and solder-based fixing methods have become common. Yes. As a conventional example of the method using such an adhesive, there is a method in which adhesion is performed after alignment adjustment between a liquid crystal display element and each color light combining unit as disclosed in Japanese Patent Application Laid-Open No. 10-010994, or Japanese Patent Application Laid-Open No. 2001-2001. A method according to Japanese Patent No. 100185 is known.
[0003]
[Problems to be solved by the invention]
However, in the method of bonding after alignment adjustment, such as the method described in Japanese Patent Application Laid-Open No. 10-010994, it is difficult to maintain the quality because of the change over time, and the size of the liquid crystal display element is reduced and the definition is high. There is a problem in adopting it as a fixing method when performing high-accuracy adjustment accompanying the process. In addition, this method requires an adjustment member for adjusting the position of the light valve, which increases the number of parts, accumulates errors in accuracy, and increases the adjustment cost. Have. Further, in the method described in Japanese Patent Laid-Open No. 2001-1000018, the fixing position and dimensions of the fixing with solder are not clearly shown, and the change with time after alignment adjustment occurs depending on the fixing position and dimensions of solder. End up. Therefore, the present invention solves the above-described problems in the conventional device, eliminates the occurrence of changes over time after alignment adjustment between the liquid crystal display element and each color light combining means, and reduces the size and definition of the liquid crystal display element. It is an object of the present invention to provide a mounting structure and a mounting method for a liquid crystal display element in a liquid crystal projector capable of high-accuracy adjustment.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is characterized in that the mounting structure and mounting method of a liquid crystal display element in a liquid crystal projector are configured as follows (1) to (9).
[0005]
(1) The present invention synthesizes the separation optical means for separating the light source into light beams of a plurality of colors, a liquid crystal display element that modulates the separated light beams, and the light beams modulated by the liquid crystal display elements. The liquid crystal display element mounting structure in a liquid crystal projector having a combining means and a projection lens for projecting the image light combined by the combining means, wherein the liquid crystal display element is fixed to a first fixing member, The fixing member is fixed to the combining means for synthesizing the luminous flux, and the first fixing member and the second fixing member are constituted by a hole provided in the first fixing member and a shaft provided in the second fixing member. The space is filled with the first fixing material and fixed by solidification, and the second fixing material is filled and solidified at a predetermined interval constituted by the first fixing member and the second fixing member. Yes.
[0006]
(2) In the present invention, a space constituted by the first fixing member and the second fixing member, the hole provided in the first fixing member and the shaft provided in the second fixing member, The liquid crystal display element is provided at four corners of the four corners.
[0007]
(3) In the present invention, the first fixing member and the second fixing means to which the second fixing material of the second fixing member is applied are provided at a plurality of positions above and below the liquid crystal display element. One of them is selected, and the second fixing material is applied and fixed.
[0008]
(4) According to the present invention, the predetermined interval provided between the first fixing member and the second fixing member is twice the vertical adjustment range required when the liquid crystal display element is attached. It is characterized by the degree.
[0009]
(5) The present invention synthesizes the separation optical means for separating the light source into light beams of a plurality of colors, a liquid crystal display element that modulates the separated light beams, and the light beams modulated by the liquid crystal display elements. The liquid crystal display element mounting structure in a liquid crystal projector having a combining unit and a projection lens for projecting the image light combined by the combining unit, wherein the liquid crystal display element is fixed after alignment adjustment The fixing material is a UV adhesive. After the UV adhesive is filled in the space between the hole portion and the shaft portion formed by the first fixing member and the second fixing member and UV irradiation is performed, the UV fixing is performed, The liquid crystal display element of the first fixing member is vertically fixed by filling solder at predetermined intervals with the fixing portions provided above and below the second fixing member.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can achieve the above-described problems of the present invention with the above-described configuration. More specifically, for example, the present invention can be implemented by the following embodiment. In the embodiment of the present invention, the configuration includes means for emitting white light, separation optical means for separating white light into R, G, B light, and R, G, B light transmitted through the liquid crystal panel and separated. In a liquid crystal projector having a synthesizing unit for synthesizing and a projection lens for projecting the synthesized image light, the separation optical unit and the projection lens unit are configured as one structure, and R, G, B liquid crystal display elements described below A unit (hereinafter referred to as a prism unit) fixed to the combining means is attached to the structure.
[0011]
The prism unit has a structure in which a synthesizing unit that synthesizes R, G, and B light is arranged on the base member, and a second fixing member is directly attached to each surface of the R, G, and B on the synthesizing unit. The synthesizing means is bonded to the base member and fixes it to the structure. In addition, each liquid crystal display element that modulates each light is fixed to the first fixing member, and a plurality of protrusions for applying the first fixing material to at least one of the first fixing member or the second fixing member. Further, the first fixing member and the second fixing member are configured by arranging the second fixing material at two locations on the upper and lower sides.
[0012]
The first fixing member and the second fixing member are configured to have a clearance for alignment adjustment. This clearance amount is twice the adjustment range in the vertical and horizontal directions required when the liquid crystal display element is attached. Have a degree. With these configurations, when fixing the alignment of a liquid crystal projector, it is possible to fix the main body by soldering after temporarily fixing the UV, and it is possible to fix the liquid crystal display element with a smaller size and higher definition. It becomes. According to the present invention, the number of parts can be minimized, the space between the optical axis space and the adjusting mechanism can be reduced, and the size of the main part of the optical system is reduced. An optical unit configuration can be adopted.
[0013]
Hereinafter, embodiments of the present invention will be described. FIG. 1 is a plan view showing the configuration of the embodiment of the present invention, and FIG. 2 is a perspective view of the configuration of the prism unit that combines the R, G, and B light configured in FIG.
[0014]
An illumination optical system, a synthesis optical system, and a projection optical system configured in a general liquid crystal projector will be described.
[0015]
The lamp burner 1 is inserted into the lamp housing 2 and is lit by an electric circuit (not shown). The curved surface of the lamp housing 2 is set so that the light beam from the front surface of the lamp housing 2 becomes a substantially parallel light beam.
[0016]
White light emitted from the lamp passes through the first fly-eye lens 3, is reflected by the first reflecting mirror 5, and passes through the second fly-eye lens 4. The light beam that has passed through the second fly-eye lens 4 is designed so that the light beam irradiated from the lamp housing 2 is integrated and the luminous flux in the optical path is made uniform.
[0017]
The integrated light flux is deflected when passing through the PS conversion element 6, the direction of the deflection is unified in a fixed direction, and reaches the condenser lens 7.
[0018]
The dichroic mirror 8 is coated with a spectral transmission film so that blue light rays are reflected and other light rays are transmitted and split.
[0019]
The divided blue light is transmitted through the concave lens 9, reflected by the second reflecting mirror 11, transmitted through the condenser lens 18 and the polarizing plate 23 bonded to the condenser lens 18, and transmitted through the liquid crystal display device 26 for blue display. To reach.
[0020]
On the other hand, the light beam that has passed through the dichroic mirror 8 passes through the concave lens 10 and reaches the second dichroic mirror 12.
[0021]
The second dichroic mirror 12 is coated with a reflective film that reflects green light and transmits other light rays, and separates the reached light rays.
[0022]
The split green light beam passes through the condenser lens 19 and the polarizing plate 20 bonded to the condenser lens 19 and reaches the transmissive liquid crystal display device 25 for green display.
[0023]
On the other hand, the light transmitted through the dichroic mirror 12 is cut off by the red transmission filter 14 except the red light, and only the red light beam is reflected by the reflecting mirror 33, the concave mirror 22 and the free curved surface which are configured by a free curved surface. The reflection is repeated by the configured reflection mirror 34 and reaches the filter 21. The three mirrors of the reflecting mirror 33 configured by a free curved surface, the concave mirror 22, and the reflecting mirror 34 configured by a free curved surface are configured as a relay optical system.
[0024]
The light beam that has passed through the filter 21 reaches the transmissive liquid crystal display device 24 for red display.
[0025]
The light beams dispersed into blue, green, and red cause an image displayed on each liquid crystal display device to be displayed as an image by transmission / non-transmission of the liquid crystal display device.
[0026]
Each transmissive liquid crystal display device (24, 25, 26) is connected to a circuit (not shown) inside the liquid crystal projector, processes a signal from a video output device (not shown), and is a circuit inside the liquid crystal projector (not shown). The image is displayed by the signal processed by (shown).
[0027]
The light rays that have passed through the liquid crystal display device are combined by the combining optical system 32 into the light beams dispersed in blue, green, and red, and are guided to the projection lens 31. The composition optical system 32 has the following types of configurations, such as a commonly used cross dichroic prism, a triangular prism composed of four pieces and having a dichroic film formed on each surface, or 3 It is a triangular prism composed of two pieces and having a dichroic film formed on each surface, and all have a structure that synthesizes light beams that are split into blue, green, and red.
[0028]
The projection lens 31 is composed of a plurality of convex lenses and concave lenses, and magnifies and projects the light beam transmitted through the combining optical system 32 onto the screen. It is also possible to configure as a zoom lens that changes the magnification by moving a plurality of convex lenses and concave lenses.
[0029]
Next, the configuration and attachment of the combining optical system 32 and the transmissive liquid crystal display devices (24, 25, 26) will be described with reference to FIG. In the present embodiment, a description will be given of a synthetic optical system in which four atypical triangular prisms are bonded together.
[0030]
The combining optical system 32 is configured by bonding prisms 32a, 32b, 32c, and 32d made of four optical glasses, and a dichroic film that reflects blue is coated on the bonding surfaces of 32a and 32b. A dichroic film that reflects red light is coated on the bonding surface of 32c and 32d, and the light emitted from the transmissive liquid crystal display device of each color is reflected and refracted to the emission surface (not shown) and guided. . Hereinafter, the bonded prism unit is referred to as a prism.
[0031]
Surfaces other than the transmission surface of the prism are configured in a ground glass shape to cut unnecessary light. A base 36 for attaching to the optical unit box of the liquid crystal projector is bonded to the lower surface of the bonded prism. The base 36 is provided with three foot portions 36a for attaching to the optical unit box in the vicinity of each transmissive liquid crystal display device, and is fixed by screw screws.
[0032]
The transmissive liquid crystal display device (24, 25, 26) is fixed to a liquid crystal plate mounting plate 34 (common to each transmissive liquid crystal display device) with screws (not shown). Four holes 34a are provided on the outside of the liquid crystal plate attachment plate 34 in the vicinity of the liquid crystal attachment screw portion, and a plurality of second fixing portions 34b are provided above and below the transmissive liquid crystal display device.
[0033]
The base plate 35 is provided with two mounting surfaces 35c for bonding to the upper and lower frosted glass surfaces of the prism, and the mounting surface 35c and the prism are positioned by a jig using an ultraviolet curing adhesive and positioned at a predetermined position. It is fixed to.
[0034]
One base plate 35 is arranged for each of the green, blue, and red colors of the prism.
[0035]
The base plate 35 has four projections 35a penetrating through the holes 34a of the liquid crystal mounting plate 34, and the holes 34a and the projections 35a of the liquid crystal mounting plate 34 have an adhesive adjustment margin at the time of mounting. It has a clearance with a space that takes into account the space in which it accumulates. The clearance is optimally about 6 to 10 times the amount in consideration of adjustment, and about 0.6 mm to 1.0 mm.
[0036]
The base plate 35 is provided with a second fixing portion 35 b at a position facing the second fixing portion 34 b with the liquid crystal mounting plate 34. A clearance is provided between the second fixing portion 34b of the liquid crystal mounting plate 34 and the second fixing portion 35b of the base plate 35, and the amount of clearance is two to three times (0. 4mm to 0.6mm).
[0037]
Next, the adjustment method and the fixing method are described. A polarizing plate is attached to each color incident surface of the prism, and a base 36 is fixed to the lower surface of the prism with an adhesive. A base plate 35 is set on a jig, an ultraviolet curable adhesive is applied to each mounting surface 35c, and ultraviolet rays are irradiated to cure and fix. The unit is attached to the fixing device, an ultraviolet curing adhesive is applied to the hole 34a of the liquid crystal plate mounting plate 34 to which the transmission type liquid crystal display device is previously attached, and the chucking portion 34c of the liquid crystal mounting plate 34 is attached to the fixing device. The hole 34a of the liquid crystal plate mounting plate 34 is inserted into the protrusion 35a of the base plate 35 of the unit.
[0038]
A signal is sent to the liquid crystal display device to adjust the center position of the liquid crystal to the reference position. Thereafter, the X, Y, and θ axes of the six axes (X, Y, Z, θ, X tilt, Y tilt) are adjusted so that they face the screen. As described above, the position of the transmissive liquid crystal display element used as a reference for one of the three colors is determined. Thereafter, the other two-color transmissive liquid crystal display elements are inserted into the projections 35a of the base plate 35 with the holes 34a of the liquid crystal plate mounting plate 34 coated with the ultraviolet curable adhesive in the same manner as described above, and the six-axis is fixed by the fixing device. (X, Y, Z, θ, X tilt, Y tilt) X, Y, and θ are adjusted so that they are aligned with the reference transmissive liquid crystal display element that is first aligned.
[0039]
After the alignment adjustment is completed, each ultraviolet curable adhesive is irradiated with ultraviolet rays to solidify the adhesive.
[0040]
Next, solder is melted between one of the plurality of second fixing portions 34b on the upper side of the liquid crystal mounting plate 34 and the second fixing portion 35b of the base plate 35 to cool and solidify, and the upper side on the lower side of the liquid crystal mounting plate 34 Solder is melted between the second fixing portion 34b opposite to the second fixing portion 35b of the base plate 35, cooled, solidified, and finally fixed. After this fixing, the alignment adjustment is confirmed, and if there is no problem, the adjustment is completed.
[0041]
【The invention's effect】
As described above, according to the present invention, the change with time after alignment adjustment between the liquid crystal display element and the color light combining means is eliminated, and the liquid crystal display element size, particularly 0.7 inches or less is reduced. The liquid crystal display element can be mounted in a liquid crystal projector that requires high precision and high precision adjustment.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of a liquid crystal projector according to an embodiment of the invention.
FIG. 2 is a calibration perspective view of a prism unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Burner 2 Lamp housing 3 1st fly eye lens 4 2nd fly eye lens 5 Reflective mirror 6 PS conversion element 7 Condenser lens 8 Dichroic mirror 9 Concave lens 10 Concave lens 11 Reflective mirror 12 Dichroic mirror 14 Red transmission filter 18 Condenser lens 19 Condenser lens DESCRIPTION OF SYMBOLS 20 Polarizing plate 21 Filter 23 Polarizing plate 24/25/26 Liquid crystal display element 27/28/29 Deflection plate 30 Concave mirror 31 Projection lens 33/34 Free-form surface mirror 34 Liquid crystal attachment plate 35 Base plate 36 Base

Claims (5)

Separation optical means for separating the light source into light beams of a plurality of colors, a liquid crystal display element for modulating each of the separated light fluxes, a synthesis means for synthesizing the light fluxes modulated by the liquid crystal display element, and the synthesis means A mounting structure for the liquid crystal display element in a liquid crystal projector having a projection lens for projecting image light synthesized by:
The liquid crystal display element is attached to a first fixing member, a second fixing member is attached to the means for synthesizing the light beams, and a second hole is formed in a square hole of the first fixing member. A first fixing material is applied to a space formed by the protruding shaft portion of the fixing member, and the first fixing material and the second fixing member are fixed to a space defined by the hole portion and the shaft portion. And a fixing portion having a predetermined distance from a fixing portion provided above and below the second fixing member is provided above and below the liquid crystal display element of the first fixing member. A second fixing means for fixing the first fixing member and the second fixing member by using a second fixing material for the fixing portion of the fixing member and the fixing portion of the second fixing member. A mounting structure of a liquid crystal display element in a liquid crystal projector characterized by the above. The first fixing member and the first fixing means to which the first fixing material of the second fixing member is applied are provided at four corners in the vicinity of the liquid crystal display element. A mounting structure for a liquid crystal display element in the liquid crystal projector according to claim 1. The first fixing member and the second fixing means to which the second fixing material of the second fixing member is applied are provided at a plurality of locations in the vicinity of the liquid crystal display element, one at a time. The attachment structure of the liquid crystal display element in the liquid crystal projector according to claim 1, wherein the second fixing material is applied and fixed. The predetermined interval provided between the first fixing member and the second fixing member is about twice the vertical adjustment range required when the liquid crystal display element is attached. A mounting structure of a liquid crystal display element in a liquid crystal projector. Separation optical means for separating the light source into light beams of a plurality of colors, a liquid crystal display element for modulating each of the separated light fluxes, a synthesis means for synthesizing the light fluxes modulated by the liquid crystal display element, and the synthesis means A mounting structure for the liquid crystal display element in a liquid crystal projector having a projection lens for projecting image light synthesized by:
The first fixing material for fixing the liquid crystal display element by adjusting the alignment is a UV adhesive, and the UV adhesive is attached to the hole portion and the shaft formed by the first fixing member and the second fixing member. After filling and solidifying by temporarily irradiating the space of the part with UV irradiation, the fixed part provided above and below the second fixing member and the fixed part provided above and below the liquid crystal display element of the first fixing member A method of mounting a liquid crystal display element in a liquid crystal projector, wherein the interval is filled with solder and fixed.

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